6444776089 has 4 divisors (see below), whose sum is σ = 6445393956. Its totient is φ = 6444158224.

The previous prime is 6444776081. The next prime is 6444776099. The reversal of 6444776089 is 9806774446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4829138064 + 1615638025 = 69492^2 + 40195^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444776089 - 2³ = 6444776081 is a prime.

It is a super-2 number, since 2×6444776089² = 83070277674692271842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6444776081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293014 + ... + 314239.

It is an arithmetic number, because the mean of its divisors is an integer number (1611348489).

Almost surely, 2^6444776089 is an apocalyptic number.

It is an amenable number.

6444776089 is a deficient number, since it is larger than the sum of its proper divisors (617867).

6444776089 is a wasteful number, since it uses less digits than its factorization.

6444776089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617866.

The product of its (nonzero) digits is 8128512, while the sum is 55.

The square root of 6444776089 is about 80279.3627839683. The cubic root of 6444776089 is about 1860.9553123385.

The spelling of 6444776089 in words is "six billion, four hundred forty-four million, seven hundred seventy-six thousand, eighty-nine".